I was playing as the Turks, and I had conqured all of greece, babylon, arabia and persia. After a while the babylonians declare independance from me, which irritated me, but I knew it would happen sooner or later, so I decided to just declare war and kick their ass. Suddenly I found that I was also at war with Germany (the most powerfull nation at that time, but also had generally been my friend) and Mali (Germany's vassal, and also my friend). It turns out that between my turns, the babylonians declared independance and also signed on to becoming vassals of germany!
Rebelling civs shouldn't be able to sign any vassalization/defensive pacts in their first turn, otherwise bad things happen
Rebelling civs shouldn't be able to sign any vassalization/defensive pacts in their first turn, otherwise bad things happen